Tuesday, January 26, 2016: 11:15 AM-12:45 PM
International Design
Chair:
Steven T. Taylor, P.E., Taylor Engineering, LLC
Technical Committee: 04.01 Load Calculation Data and Procedures
CoSponsor: 06.07 Solar Energy Utilization
Large glazed façade results in high building heating and cooling loads, and thus significant financial and environmental burdens. Double skin façade (DSF) is one potential response to these problems. This seminar explores DSF dynamics, design, modeling, case studies, seasonal control strategies and energy efficiency. This session provides ASHRAE members with a fundamental understanding of DSF principles, challenges, key influential factors, evaluation criteria, and design and modeling approaches.
1.00 Thermal Performance of Double Skin Façade with Buoyancy-Driven Airflow
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John Zhai, Ph.D., University of Colorado |
This talk reviews the main parameters for double skin façade (DSF) design. It introduces an integrated and iterative modeling process for analyzing the thermal performance of DSF cavities with buoyancy-driven airflow by using an energy simulation program (BESP) with a CFD package. The model and the modeling process were calibrated and validated against the experiment. Correlations were developed that can be implemented in a BESP, allowing to keep the accuracy gained from CFD without the computation time. The correlations are valuable for “back of the envelope” calculation and for examining accuracy of zonal-model-based energy and airflow simulation programs.
2.00 Double Façade Influence on Heating and Cooling Load: Three Models for Calculation of Interspace Temperature
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Branislav Todorovic, Ph.D., University Belgrade |
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Tanja Cvjetkovic, P.Eng., Delhaize Group |
Heating and cooling load calculations are presented for a double facade building located in South-East Europe. The analyzed construction of a double façade is the one mostly used in building practice: the outside façade is entirely glazed envelope, the inside façade is a combination of windows and walls. The analysis treated different façade orientations. The calculations were performed using three thermodynamic models: the model developed by authors and two models used in practice. The calculations were performed for different orientations of the facades, during sunny and cloudy days in summer and winter conditions, as well as for different glass properties.
3.00 Assessment of Climatic Parameters Inside Experimental Room Equipped with Box Double-Skin Facade
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Gabriel Nastase, Ph.D., Transilvania University From Brasov |
The next generation of windows and glazing technologies for buildings, such as the one presented in this study have potential to reduce energy consumption in office buildings and in the residential sector. The research aims to highlight the interior comfort conditions for an office space equipped with a box double-skin facade placed in Brasov, Romania. Interior comfort conditions are evaluated by analyzing important parameters such as CO2 levels, natural lighting, noise and ventilation. The conclusion is that to overcome the mere role of thermal/noise insulation system, a double skin facade is mandatory to have a BMS, that enables a complex control and efficiency.